How Did the Chapman Study Demonstrate Voice Stress Analysis Validity for Law Enforcement? In 2012, Professor Emeritus James Chapman conducted a retrospective analysis regarding the use of voice stress analysis (VSA) in law enforcement settings. As the Former Director...
Research and Scientific Studies
Scientific Study Summary: Hasan, Y. (2017). “Violent Video Games Increase Voice Stress: An Experimental Study.” Psychology of Popular Media Culture 6(1), 74-81.
In the field of law enforcement, voice stress analysis technology such as the Computer Voice Stress Analyzer (CVSA ®) is used in a range of applications, including criminal investigations, employment interviews, and immigration investigations. The CVSA detects changes...
Scientific Study Summary: “Analysis of Voice Stress in Call Centers Conversations.” Grazyna Demenko and Magdalena Jastrzebska. 2012
Prioritizing Emergency Calls: How Can Dispatchers Use Voice Stress Analysis? The Computer Voice Stress Analyzer (CVSA®) has shown great value as a tool for law enforcement professionals to detect deception. It is commonly used to help solve criminal cases, screen job...
Scientific Study Summary: “An Acoustic Method to Quantify Perceived Vocal Tremor,” Marios Fourakis University of Wisconsin 2010
Diagnosing Speech Disorders: Can Voice Stress Analysis be Used in the Medical Field? Although Computer Voice Stress Analysis (CVSA) is most commonly used to interview suspects and witnesses in criminal investigations, the technology’s ability to identify vocal tremors...
Scientific Study Summary: “Structured Interview Assessment of the Field Use of Voice Stress Analyzer Technology.” Department of Defense, 30 Mar. 2007.
How is Voice Stress Analysis Technology Viewed in the Law Enforcement Community? In the mid-2000’s, the Department of Defense set out to conduct a qualitative study to investigate the validity and reliability of voice stress analysis (VSA) technology in a military...
Scientific Study Summary:“Policy Review: CVSA is a Valid Law Enforcement Tool.” Hugh Wilson Ridelhuber and Patrick Flood. 2002
What are the Benefits of Voice Stress Analysis for Law Enforcement? In August 2002, Dr. Hugh Wilson Ridelhuber and Dr. Patrick Flood submitted a policy review to the Law Enforcement Executive Forum to demonstrate the validity of the Computer Voice Stress Analyzer...
Scientific Study Summary: Cistaro, Victor, Ph. D. “A Comparison Between Decision Accuracy Rates Obtained Using Polygraph and the Computer Voice Stress Analyzer in the Absence of Jeopardy.” The Department of Defense – Polygraph Institute, Aug. 1995.
How Did the Department of Defense Verify the Theory Behind Voice Stress Analysis? In 1995, a new type of truth verification technology was making its mark in the law enforcement community: the Computer Voice Stress Analyzer (CVSA®). First introduced by the National...
Scientific Study Summary: Eden, G. and Inbar, G.F. “Psychological Stress Evaluators: EMG Correlation with Voice Tremor.” Department of Electrical Engineering Technion, Israel Institute of Technology, Haifa, Israel. 1976
How Did EMG Experiments Lead to Contemporary Voice Stress Tests? Over the course of about a decade, J. Gary Eden and Gideon F. Inbar—two researchers in the Department of Electrical Engineering Technology at the Israel Institute of Technology—conducted multiple studies...
Scientific Study Summary: “The Rhythmical Activity of Groups of Motor Units in the Voluntary Contraction of Muscle.” O.C.J. Lippold, J.W. T. Redfearn, and J. Vuco. University College London 1957
What Early Scientific Studies Led to the Development of Computer Voice Stress Analysis? The scientific research behind the Computer Voice Stress Analyzer (CVSA) goes back over sixty years. One of the earliest studies, published in 1957 by O.C.J. Lippold, J.W.T....